<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }

    .box {
      width: 1000px;
      height: 600px;
      display: grid;
      grid-template-columns: repeat(6, 1rf);
      grid-template-rows: 1fr 2fr;
      gap: 40px;
      grid-template-areas:
        "a b c . . d"
        "a . e e e f"
      ;
    }

    .box div {
      background-color: green;
    }

    .box .a {
      grid-area: a;
    }

    .box .item1 {
      grid-area: b;
    }

    .box .item2 {
      grid-area: c;
    }

    .box .item3 {
      grid-area: d;
    }

    .box .item4 {
      grid-area: e;
    }

    .box .item5 {
      grid-area: f;
    }
  </style>
</head>

<body>
  <div class="box">
    <div class="a">aside</div>
    <div class="item1">1</div>
    <div class="item2">2</div>
    <div class="item3">3</div>
    <div class="item4">4</div>
    <div class="item5">5</div>
  </div>
</body>

</html>